Got a chance to take my new to me .36 cal Seneca out today. Just shooting at 25 yards I shot both PRBs and MaxiBalls out of it using 35 gr of Goex FFFg. I only had time for a few shots because I was working with my Knight Mountaineer and had to get home to take my grandsons to speed training for football.
Anyway, the 3 shots with the PRBs were definitely not impressive. Patches were drill cloth and with the .350 RB were tight. I can possibly get them shooting better. However the MaxiBalls with the same 35 gr were really good (lubed with NASA lube and synthetic 2 cycle oil mixture). See attached targets.